SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ee5cb7e0435f709acd878ef3b68f538e1410e2d26318af0985f475529737a22' 
  AND token = 'svVVZ0EdIV/hD4Bjg7eeF9ukYWeuJgEvXEEw9Mhm4xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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