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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb075569fb2fd48e77f707dc4681255a2153be901fec340767fbfee23dffc50d' 
  AND token = 'defdXaUMFJL4ea0LP4GmEerl2beUY81wDN0N4FfSC4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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