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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ae5ee8050a361182bbdc5c067516c61408ad61a3139b2816c04991da5da8438' 
  AND token = 'ddcbVGe8tzGlPdQNiG4pQ0lc4E60IDR3Uw+5dtROnUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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