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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e5a862c956c2909f0951e6df8e3a79b117cd36fee7f066cd6df1a0ca6d3e8fa' 
  AND token = 'gX0811Z6P4HATcoLecZ1ylZPMGfKBx22zcj5CDPh0tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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