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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fd89a6798277b5cf69a2f0af6bb7987b054bc5c32c9f926eab31904364e2820' 
  AND token = 'JM0W9WTSiiFYF6rjYnA8eOPG/BuM5R80zCv7Qjd519M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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