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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '219f7588a10e99e7d958330595a67ac64a5cc0eea64e881ee4ec854e7bffd7c8' 
  AND token = 'p44VKj5ih1R8pa2Wv+tYnzfxJksqzzWRf/YozroEtS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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