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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fcd1714fc707667c5a0a8ea6dae1d0a4d27c8aeb4e0ba42262619707a115e87' 
  AND token = 'bYfxiwWN5Ww4vzW+SojbtRSIBt7cS4wfQtR6EPltyi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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