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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26fde46fa1e674f7d75811e7e46481dda7e4d6a4b08b46bbf9b4366796271b7e' 
  AND token = 'DGhGg24kfP4n7DTIGMkvBsSmfvOyhYHeU9eFQLyI/4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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