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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60d11d802653e99236a25ea06d99bd9586eca8884adae66e219026a67ffbd121' 
  AND token = '6wCFVcT8qageyUbsT9xain/p+PbiC7jD1pWKw2AKd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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