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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6befb847a8dc5eb110101a87c6dffa6e56e61e3f86580b3df218946c2ebfd6ca' 
  AND token = 'n9nEnHPG7IBaDNMq92TbfVpEWjzV266nv2TaJlyDK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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