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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc4e6c09ca0f29789fc56ede28a53dab40e92f9af1f9f57667511ce1e77fbe74' 
  AND token = 'c1rb10oDiVYfQoKClS3q0bCcZ6jGlwg8AhYgeKXg+iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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