SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80d0e8f610a951e49df851279736f538ef593040b8b9cbfe11925bed9db6f64d' 
  AND token = '714Dd40+EGs89qz//6LJuDm2NWNgxshrQEYbdSznpwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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