SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d8d0adf52f25e47c5bb99c3a062624d547d3ad48edbaedc5e3ebe40190f92a2' 
  AND token = 'hFlK14ng1cxtLDg3D61tGvAWzLFZU1Lm8YTvoQJisSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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