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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7004ec90e4ba71d7b77e32ca39de7f78db9fca5893c7e58e7c8a57679604f9' 
  AND token = '45cVaorrFCJWg6w2KWmSxMX/rBj9c1gridF1IVgnI3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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