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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19e384a109af34b4f3117d023c4cc47bb53879bd73c352eea03be22214a27455' 
  AND token = 'n5npeClCSTM421LBdRn0Bfd7f14FEZz3wuGexM5DToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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