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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ed3f989e22ddec5b46942b8505204c20234b59ab8c533b5bab793a9e731b8b8' 
  AND token = 'ts6ZujaAt0l+8k6e+IYheTCLOVeg2TOVi62Ya4raqok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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