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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7baa60fe9d3e7dc3a9f632d52174e1c79558831e9ce449cf1bd4b8d5d91d584' 
  AND token = 'oqMgWShqgsWIDAODgdjv1crPl00j6SYgR2jfuCL40I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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