SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '222833e5546cf3b36ac55319f20b7094eab98be39cb5073448dda23c2887d5a5' 
  AND token = '6WRK/+y5FuFBxZSNEhSzQZ6bdxbyt1Bp/kTowezCWFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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