SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c9fb3c03a712ed27829f45c6ef28891c8af485956d7573749e19b6b5a4114d' 
  AND token = '9WUPhKrhraqMBcNXc3kc/4SZVKg5OfuuGYGEVWclDcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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