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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c29d13faef5965a1ad8b715afb3b656702e3e9072b7f982f3650d4f77b3f7a2' 
  AND token = 'rizeBO/J0tWaVBYG42t4NEHMUdwoas+UhyJyfMyniRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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