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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8edd50824c9f7deb3ea4c8f32ac9a2ab86fdd857ce27daa4fed10f365f75b39' 
  AND token = 'M66PVSV3UMF3l/aU/aXsnj7SGGJsqqwooiNXGy0EitA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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