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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6c7adf5b4c53ed33198aea67f322e08bc09948175319ac713b9da87ac73a059' 
  AND token = 'wcLPFVnCNbbghnHx73fwObN2cCF9ZWvh6kZnaGaV1sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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