SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b8c395d519309b2ad63623afd05567a208448353b4ba8994201719ba276f2c5' 
  AND token = 'Uw+s/R6lQ58OEGF7wK9o6uF4cIkRg6hq5VcNZBbF8ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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