SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb2363ab92d0713b4a05bb2cb52f9b65b448749ee3317d8f635f7deb7a158c2c' 
  AND token = 'wlwX+rzkEi3FBQCR5NxUjVXiTy1uN5YOrru6cJoFxWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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