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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4561f65cef56f707b4471a3d698be8f3a4e8612b9cbecf6e3647029bb6adbf4' 
  AND token = 'wHNwL8s3Ly1Jqh4IiMJChhcyeom6D9z6zCwlhwQ3Mo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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