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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '251b86d12e26f32d1e48b5ff1223f7332ed3ea53fd2c110296d7056eb307b4f7' 
  AND token = 'yUK9xql8UTp8ap6NiyXmGLt9d8d779jjoeQsMGVqEcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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