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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53248d8b4ead1a3ad6635552c68b925248f5f1172e49d3ba7a647bb79f4b27ff' 
  AND token = 'a2oVknntC9q1+SvkGayd5FGxoEycj7T5PFbsKGt8N5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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