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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8d5b531e9ebd00803ceaaf79349b4188c0e904f16c69813d540d59b95fc4564' 
  AND token = 'Dbuf52trBuDwk2AyV3vCWlWHT6m9Yps2Z7wFktZ05t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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