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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '152fc81e0700f341c5769813ef3e55527ec49d9670f1efb9dd0549b57b0176f9' 
  AND token = 'XnYErF14BTL7OQUAs9ZPBf3YdkFyjpLMKr/Aez020pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}