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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8b36d6516ad5cec27723b2c8ee999d86e2f3f04975757bb3f04b17ed0a4f76a' 
  AND token = '1Cde7i6RPB8+J41TV1Tv9fuxVkH6AIulqMs7P2wqECE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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