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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f35cc3f14fbad3316d3274e75d207d1426301ce334a2e8aa3c1fa5237b42ae8' 
  AND token = 'UI36qPmjGUvpP8e892A+RENOg/B7mGhcrevj/+rC9o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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