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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '412af98735d5bc73dccf7feb5bbcde37ef3fdfb113ea2a5076356e8376224b24' 
  AND token = 'JCFBRHFp6/TfAtGXeME1ThjDDMZN+y3wJe1Fje5eHrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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