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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '097504b2e0048d2e66248bc308613a9058f8ec7e99ef3fe5685ddca58a0d63f7' 
  AND token = 'u1JS/qIwv0AbXZoeXlDqyXaY9rzWpd0BeDZ3IgNezt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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