SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbc6ad9c6ce478ebbb42d12ce3e42cf80a6e8e5f773da14583c1270abfd9ea60' 
  AND token = 'w8yJ+7IYKC0+kFOSAcvFvZgvXdBA0m6Gr8zg1bqjMG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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