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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc9235a2fccfd0fc64aea2fae93e82ed3e237e5e0d558f240a2e40f8fa55b6a9' 
  AND token = 'xqmAw/qF2Cxg4HVWpI7Z2BRjCrvFkRmq7TVzlntEq9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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