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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '897432f7fc3daf0d3f52488da340d1324f53be278d80dfc73000842e08349fca' 
  AND token = 'g5BThtOmE7jeNmyus6jF8bh8A2Fyh6fJ68n4ORcycKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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