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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae715f239c9b4475ff7b7c9d31860347e1def50e13fea1eea18b4cd469204857' 
  AND token = 'FqKiiEnlHT+gKBfoR7VoRSEyxqhuod2ujex/yEDVQOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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