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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23181738761c7cfa743287878fce1043e447f9338742a47cc7cc6fbdf2bfc7b8' 
  AND token = 'JDKauHA/uiupalyyTZOazuFzcoYJmPY2p3e/XePYwQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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