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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6627bc1e1ebe9ad8e424775c1519eebd6cd0410a8456ebd2b6b87f3bb96ba591' 
  AND token = 'ZNXzDbdN1tBG6T/k3v3U2SNjbdYtFkoi0YRK9v2CnKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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