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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa16a093b35f19f3f240fe213791ef93b0e0bd9479af8954ee84cc40cc331db7' 
  AND token = 'kOlWl+aPBIEUqa0V0cWqnalOpJpJezx+ez3dv69uhVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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