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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc554357348a79aa1e85b45c83d64db6d891c766c3adb68bbc6e28c64216ee20' 
  AND token = '8sGurp8KrsiTXxk/fZcvaGwbTU7G9XZx5vsOWR27taI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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