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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f395cd5a30a8869b496302f7f0ca5f59ecf61bc940187585fe2bb0a81b03bb09' 
  AND token = 'tsNO6ywNQ5NGr+f50d2Nq3ZdqS0gMv8G9FadABt1W6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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