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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d6d2be585caf1119fb387edd3d06ccd4c9042992c4e2056a19a4a28dcff56d7' 
  AND token = 'xFvaEvmUljreTj8ddcqZmrcrhonxuJwhB5tO2v+ESD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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