SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8de261a950a7248fcb5c056a11a9374a1ed4df8caffe5030e25785d69632814e' 
  AND token = '4RJOCBLm8dDUbmDgADhJQ8bVGHKBaZbqnlz6bnXcGUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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