SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e69118cf7efcb5ef9d1b2e16976bad3bdf5b764a30ff7cf5dc38acdb77a59f02' 
  AND token = 'GJPq//N0tzBDHJmL0VWQONS0pC0MFKBXzMwwiPE75uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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