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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d9dcb961390307b06ab54d348e9bb77507d59fb7e3593bbdc990084173c6dc0' 
  AND token = 'Mn5iT/pQTh8d7eC7ajfHAg70LtNcy/C2KdiDLPK8Di0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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