SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16da0531447509c973f5e16439bbc08b3e3f73050a3a55759b211baab19b95f5' 
  AND token = 'Ii/A/WyOGG+MMpOvhmxpRY4KHZlVNTDhCA0o8ANz2O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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