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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '263e70d44b1e96f6de898fb97e95ebc69bca1cb7f198c5729689f32fb6f4a3cd' 
  AND token = 'V4bSPyVL/OMaYwWVEluW6O9MytETwJDeXFz7SWujZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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