SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd97e5c2f4a3fab9538edd92d6984753d22dd5eea527651f5a145075df411b0be' 
  AND token = '2pgOzsRAvXuc65whQwAmNeNP4w3Qe0GZ95KBaVgOyJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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