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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05173dde30da91b89a295a3e38e12a2f78e8ab32b4d7eadc5847a26764ed33a4' 
  AND token = 'S1btz9JI6bIjsklfLfZc512aeQa+ZxFaXyX2PFQX29E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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