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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42feb41b0f701ca831206a36f0e1925b5a95dc8439f66fe12d448242c9806696' 
  AND token = 'KLpBDl1Cbheu7GhOQs8dA6eUKd5RCX7GWKb1NNj0r6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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