SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6f660fd7938e306031d4745b13820595dc1f1d59d4da388054d67a8ec82f15' 
  AND token = 'zrWb2VWGIc0SnU8e+ZHdtBgyuW09IiGP+MQ7FqPijfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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