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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3f59033587063550d07f4bebafaeff9e9ebbd8c85b32f720a25cd189a5d984' 
  AND token = 'yuLM3FWvQDk5ppqi9NdC6yRTal0V0emYby6ij5LUloI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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