SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1327aa56648944cadfdd57a76f0ac611cd5710cc890b973607b0e371214c3d70' 
  AND token = 'h7+wwKbjJzn/ML7mkXoR8hJvb4supxH8U3brzGkD/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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