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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad2518a27592e6997f92e477a08ef980583f7afa79d4c1e709fddecd52e2a889' 
  AND token = 'EPvyEs2Zw3w4sNcZQt2T2SgsepcdV11ymHVqNYYvHyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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