Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c2914127c7a7aa4c0a5453d5a7658d52ce8eb2d0efb05617b06f9cc2dbeb5d2' 
  AND token = 'q1r2Gy5pJFEgW8RHUfddzEmfS+GGBsEK6trkwCwdZCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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