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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3892965caaf6381354b5a0856f9ba69b100c26731bfb3483ec2bd84acee1acde' 
  AND token = '3HeTQqlm/Q22Ti3A8MsJF0O9ufpNnmOwp9HFeupUYKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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