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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf45529ad925e247220d5a5f270519227398e3e5348a0ab272d502f944c9b61d' 
  AND token = 'TMNfuU9JUU0P3UenruFpGmXtEUFu10vbQmU8L022rtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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