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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd25a1c1de4f4d2b6fa62b8038a3cb04f7698b6e461031b95cff18a7f7cdbf67b' 
  AND token = '8H+ADIWtZiZYZQ0DICvtZQheKJA42y6mYf8AbO/8N7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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