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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd46e402ecb967183372bed5d0e76e142c56d0514b5f8ff8b9f26677aac485cbd' 
  AND token = '43zBTUP0kCuB2Ze1Rqyd+EXMXyH7WJaQy5okbtygmH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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