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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30a279f482318a56c4b4ab00496423113209f7e2163207a1ce5d7ba7787d3854' 
  AND token = 'xnyLqxC/Ixz7+yN8MAFAOpWP/f8kbNtbZ7cJCGIBeO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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