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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3aa03709db053ba21340b3f6ed00417ac7c12a2c9aacd6ef222956bb45aedc0' 
  AND token = 'l5dV+BeebYHdtI+1hvEndW03994wTqnNy2ZrCOsl5bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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