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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4919e50dbf74d364b190d981edf2fecd2d1d1c0af135463494cb91bd23d53c2' 
  AND token = 'eKLdWHfVsLroI7FxnDybXnYYcHh0KmeozlNlxGtLQrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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