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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '040023f7884db9d04a206223f523feba33a5711139334f6e309a2e3a084058a4' 
  AND token = 'yKznfJNeqnwbwQRNnVwupv8DPPcryaQu197M3zE9a4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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