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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '623f408774541079090b7a63e0db3fde7f62c905908a2795625c731df2fa530f' 
  AND token = '3IAF+Y5AXALcWBWAxXkZQeTLUMLJ4H3wx/W3H+uU5Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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