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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deaf859fea95be0d4f2cd708af92fde2526f0bf87840eedbcf7af6d64ba1a9c4' 
  AND token = 'iDoMD4w731V/KwxjNnPqqA3KqpLPkVxaSl42k4QMvEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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