SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ab8432f8fef7e5d10442f712d343953e59c2cad26de2a96863b62154a8d9033' 
  AND token = 'aEB2qiqOYhj76zliAOW9zrVP1LFvCb2HUbiN316I+hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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